Comment 7 for bug 1467595

Ok, as pointed out by Chris there are backtraces in XorgLogOld.txt:

(EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
(EE) [mi] mieq is *NOT* the cause. It is a victim.
(EE) [mi] EQ overflow continuing. 100 events have been dropped.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7fe465346556]
(EE) 1: /usr/bin/X (QueuePointerEvents+0x52) [0x7fe465202ae2]
(EE) 2: /usr/lib/xorg/modules/input/evdev_drv.so (0x7fe45c147000+0x60ca) [0x7fe45c14d0ca]
(EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7fe45c147000+0x658d) [0x7fe45c14d58d]
(EE) 4: /usr/bin/X (0x7fe465193000+0x96708) [0x7fe465229708]
(EE) 5: /usr/bin/X (0x7fe465193000+0xbfa79) [0x7fe465252a79]
(EE) 6: /lib/x86_64-linux-gnu/libc.so.6 (0x7fe462e59000+0x352f0) [0x7fe462e8e2f0]
(EE) 7: /usr/bin/X (0x7fe465193000+0x1b7ba0) [0x7fe46534aba0]
(EE) 8: /lib/x86_64-linux-gnu/libc.so.6 (0x7fe462e59000+0x352f0) [0x7fe462e8e2f0]
(EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (ioctl+0x7) [0x7fe462f560b7]
(EE) 10: /usr/lib/x86_64-linux-gnu/libdrm.so.2 (drmIoctl+0x28) [0x7fe46423d7e8]
(EE) 11: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe45f438000+0x6a98d) [0x7fe45f4a298d]
(EE) 12: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe45f438000+0x10dda2) [0x7fe45f545da2]
(EE) 13: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe45f438000+0x10f483) [0x7fe45f547483]
(EE) 14: /usr/bin/X (DRI2SwapBuffers+0x1d0) [0x7fe465319100]
(EE) 15: /usr/bin/X (0x7fe465193000+0x187a7c) [0x7fe46531aa7c]
(EE) 16: /usr/bin/X (0x7fe465193000+0x580a7) [0x7fe4651eb0a7]
(EE) 17: /usr/bin/X (0x7fe465193000+0x5c29b) [0x7fe4651ef29b]
(EE) 18: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7fe462e79a40]
(EE) 19: /usr/bin/X (0x7fe465193000+0x4662e) [0x7fe4651d962e]